Not gonna bother listing anything from before 2020 as that would take waaaay too long.
So everything listed here is what I played in 2021 for at least a few hours. Using current standard digital prices:
SUPERHOT: MIND CONTROL DELETE - $25
NHL 94 Rewind - $10
Donut County - $13
Yooka-Laylee and the Impossible Lair - $30
Desperados III - $60
Final Fantasy XII - $50
Control - $30
The Jackbox Party Pack 4 - $25
The Dark Pictures Anthology: Man Of Medan - $30
eFootball PES 2021 SEASON UPDATE - $30
Dirt 5 - $60
The Medium - $50
Undertale - $15
Gato Roboto - $8
Deliver Us the Moon - $25
Octopath Traveler - $60
NHL 21 - $60
Nier Automata - $40
Outriders - $60
Code Vein - $60
Wreckfest - $30
DayZ - $50
Yakuza 6 - $20
Destroy All Humans - $40
Total: $881
Upgraded 3 years of Gold to GP Ultimate in 2019. So if I break that down on the four months of 2021, I spent around $12 on Game Pass Ultimate during that time.
Amount saved in 2021: $869